VIP switch causing connections that refuse to die

Mark Goddard mark at stackhpc.com
Mon Mar 1 08:53:02 UTC 2021


On Fri, 26 Feb 2021 at 17:08, Michal Arbet <michal.arbet at ultimum.io> wrote:
>
> Hi,
>
> I found  that keepalived VIP switch cause TCP connections  that refuse to die on host where VIP was before  it was switched.
>
> I filled a bug here -> https://bugs.launchpad.net/kolla-ansible/+bug/1917068
> Fixed here -> https://review.opendev.org/c/openstack/kolla-ansible/+/777772
> Video presentation of bug here -> https://download.kevko.ultimum.cloud/video_debug.mp4
>
> I was just curious and wanted to ask here in openstack-discuss :
>
> If someone already seen this issue in past ?
> If yes, do you tweak net.ipv4.tcp_retries2 kernel parameter ?
> If no, how did you solve this ?

Hi Michal, thanks for the investigation here. There is a nice tool,
that I found far too late, that helps to help answer questions like
this: https://codesearch.opendev.org/

>
> Thank you,
> Michal Arbet ( kevko )
>



More information about the openstack-discuss mailing list